Roll-grinding machine



(No Model H. L. BAKER & P. W. WRIGHT,

ROLL GRINDING MACHINE.

No. 587,383. I Patented Aug. 3,1897.

'NITED STATES rricn.

HUBERT L. BAKER AND FRED W. WRIGHT, OF REED CITY, MICHIGAN.

ROLL-GRINDING MACHINE.

SPECIFICATION formingpart of Letters Patent No. 587,383, dated August 3,1897'.

Application filed May 11,1896. Serial No. 591 ,016. (No model.)

To all whom it may concern:

Be it known that we, HUBERT L. BAKER and FRED WV. \VRIGHT, citizens ofthe United States, residing at Reed City, in the county of Osceola,State of Michigan, have invented certain new and useful Improvements inBell- Grinding Machines; and We do declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification.

This invention relates to new and useful improvements in roller-grindersespecially adapted for grinding the rolls of flour-mill machinery; andit consists in the construction and arrangement of parts hereinafterfully set forth, and pointed out particularly in the claims.

The objects of the invention are to provide simple and effective meansfor accurately grinding the face of rolls, especially those inflour-mills, so as to effect such grinding directly from the center ofthe axis of rotation of said rolls, and a further arrangement wherebythe grinding mechanism may be driven directly from the roller-millmachinery or the series of rolls upon which the grinder is at work,enabling the rolls to be ground, if desired, without removing them fromthe machine. These objects are attained by the mechanism illustrated inthe accompanying drawings, in which Figure 1 is a plan View showing ourimproved device in the operation of grinding attached to a roller-millin which the rolls and their journals are shown in elevation and themajor portion of the frame of the machine is broken away. Fig. 2 is aside elevation showing the machine in operation upon a roll.

and ground between them, as is well understood.

In the operation of a roller-mill the greatest work upon the rolls comesat a point near their longitudinal center and after a time wears themaway at this point, leaving them with an uneven or imperfect face, whichnecessitates their frequent grinding to restore a perfect surface totheir periphery, so that the meeting faces of each set of rolls willstand perfectly parallel for their entire length.

In the ordinary manner of grinding rolls they have been journaled'in theframeof a machine and while rotated at a high rate of speed arepresented to a rotary grinder mounted in independent hearings in saidmachine, the variation of the bearings and the slight movement of thejournals of the roll, as well as that of the grinder, making it quiteimpossible to grind the surface of the roll absolutely true, while inourimproved device we work directly from the journals of the roll itself,insuring the grinding thereof concentric with its axis of rotation. Toaccomplish this, we employ a suitable frame or base-plate D, whichextends transverselyof the machine and which carries on opposite endssuitable projecting slides a, upon which are mounted the movablehead-blocks E, which are held in place by set-screws a. Passing throughthe projecting ends of said head-blocks are the cone-point set-screws b,which screw through the lugs c of said heads and are locked by theset-nuts 0'. These adjustable head-blocks are adapted to embrace theshaftor journal of the roll to be ground, which is j ournaled betweenthem through the medium of said set-screws, which enter the centers ofsaid journal to retain the roll in place, as clearly shown in Fig. 1.Mounted upon the frame D near each end is a sliding carriage F. Thesecarriages are mounted in suitable ways in said frame and are caused totravel longitudinally in unison through the medium of the screws d,which are threaded in a stud d on the outer end of said carriages andare journaled in corresponding studs f, fixed to the rearwardprojections of said frame, said screws carrying on their outer ends agear-wheel h, which en gages a worm it on the opposite ends of thetransverse shaft G, which is rotated through the medium of the crank G,whereby the screws (Z are driven and the carriages F are caused to slidelongitudinally in their ways. Journaled in the opposite inner ends ofsaid carriages is a shaft H, having upon one end a pulley I, by means ofwhich said shaft is driven through the medium of the belt I, theopposite end of said shaft carrying a drum J. Mounted upon said shaft isthe grindingwheel K, which is splined thereon so as to movelongitudinally on said shaft as well as to rotate therewith, saidgrinder being carried back and forth by means of a screw L, which standsparallel with the shaft H, and the opposite ends of which are journaledin the carriages F. Mounted on this screw L is a bracket M, having athreaded boss on, which receives said screw, and a guiding-sleeve m,which travels thereon, the projecting end i of said bracket beingforked, so as to engage freely in an annular way 2" in the hub of thegrinder K, whereby as the screw L is rotated in either direction thebracket M is actuated thereby, sliding said grinder longitudinally uponthe shaft H.

The rotating of the screw L to cause the grinder to travel back andforth upon the shaft H is accomplished through the medium of the fixedpulleys l N and the interposed loose pulley N", mounted upon the outerend of said screw, which are alternately driven through the straightbelt 0 and the crossed belt 0, leading from the drum J on the end of theshaft H, whereby by shifting said belts O 0 so that they willsuccessively drive the pulleys N N the screw L will be rotated inopposite directions in reciprocal succession, as will be wellunderstood. To effect this shifting of the belts automatically, so as toreverse the motion of the screw L when the grinder shall have traveledthe length of the roll in one direction, there is employed ashifting-bar P, which embraces said belts and is adapted to slidelongitudinally, being provided with adjustable stops 0, which are so setas to be engaged by the bracket M, whereby said bar is shifted when saidbracket reaches its limit of motion in either direction, by whicharrangement the operation of grindin g the roll is made automatic, asthe grind er, when it shall have reached the limit of its movement inone direction, immediately starts back in the opposite direction and isfed to the work, when it has reached the limit of its movement at eachend, through the medium of the worm-shaft G and the screws d, which areso constructed as to enable the grinder to be moved toward the roll butthe smallest fraction of an inch.

In the application of our improved grinder to the rolls in a machine thetop of the frame is removed, so as to expose the rolls which are leftjournaled in their ordinary boxes, as shown in Fig. 1, in which thegrinder is at work upon the roll C. \Vhen grinding the high-speedrolls,which are the rolls B O and which are driven through thepower-belt B, the belt on the opposite side of the machine which drivesthe low-speed rolls B O is removed, and the roll B is set up by slidingits movable bearings 19 through the adjustingscrews 11, so as to run infrictional contact with the roll 13 that the power to drive the grindermay be obtained through the pulley I on the journal of thelast-mentioned roll, from which the twisted belt 1 leads to the pulley Ion the shaft of the grinder, the roll 0, uponwhich the grinder isoperating, being driven through its ordinary belt B. As will be seen,the journals of the roll C are centered upon and engaged by the pointsof the set screws 1), so that the grinder K, mounted upon a framecarried by the headblocks in which said screws b are located, is made toswing concentric with the axis of retation of said roll, so that in itswork thereon the grinder travels parallel with the axis thereof, andwhen fed thereto moves directly in line with the center of said roll,thereby enabling a perfectly geometrical grinding of the roll, and thatwithout removing it from its bearings in the machine.

Each roll in the machine is ground separately and each in turn by asimple change in the belting and by merely reversing the grinder andbelting from the opposite side when grinding the alternate rolls of eachpair. The grindinganachine when in operation does not lie horizontally,but stands upward at an angle from the milling-machine, as indicated inFig. 2, in which 2 2 indicates the horizontal line through the roll.This position enables the grinder to work free from the roll not beingoperated upon, and this construction also enables the grinder to beswung over, so as to operate from either side of the roll desired, thegrinding-machine when in its working position being supported by asuitable brace. (Not shown.)

While we have shown and described our improved roller-grinding machineas applied to and driven from the rolls of a roller-mill, said rolls maybe ground when desired by taking them from the mill and centering thembetween the cone-point set-screws or analogous means to retain them inplace, the grinding and feeding mechanism being driven from any suitablesource of power.

Having thus fully set forth our invention, what we claim as new, anddesire to secure by Letters Patent, is-

1. In a roll-grinding machine, the combination of the frame havingextensions between which the roll is journaled, the rotary shaft mountedon the frame and lying parallel to the axis of rotation of said roll,the rotary grinder adapted to slide on said shaft and means for movingsaid shaft parallel to and in the direction of the center of said roll,and means for rotating said roll.

'2. In a roll-grinder, the combination with the rotary roll, the framecarrying the grinding mechanism journaled to said roll so as to swingconcentric with its axis of rotation, the rotary shaft journaled in saidframe parallel with the axis of the roll, the grinding-wheel on saidshaft turning therewith and adapted to slide longitudinally thereon,means for moving said shaft in the direction of the axis of the roll tofeed the grinding-wh eel thereto.

3. In a roll-grindin g machine, the combination with the roller-millmachine havingaseries of rolls therein, said rolls having pulleys on theshafts thereof through which they are driven, the frame carrying thegrinder mechanism pivoted to the journal of one of said rolls concentricwith its axis of rotation, the rotary shaft journaled in said frameparallel with the axis of said roll, the grinder-wheel turning with saidshaft and movable longitudinally thereon, a belt leading from a pulleyon one of said rolls to the pulley on the shaft of the grinder, andmeans for moving the grinder-wheel transversely of the axis of saidroll.

4. In a roll-grinder, the combination of the frame, the roll to whichsaid frame is concentricallypivot-ed, the shaft carrying thegrinder-wheel journaled in said frame parallel with said roll, means forrotating said shaft, a grinder-Wheel turning with said shaft andmovable. longitudinally thereon, the screw journaled in the frameparallel with said shaft, pulleys on said screw, and belts leadingtherefrom to a drum on said shaft,-the

bracket actuated by said screw and engaging the hub of thegrinder-wheel, means for automatically shifting said belts to change themotion of said screw, and means for feeding I-IUBERT L. BAKER. FRED W.WRIGHT.

Witnesses:

CHAS. A. WITHEY, J. W. MORSE.

